Bus-bar insulator Values Stye SM-25 SM-30 SM-35 SM-40 SM-51 SM-76 Tensile strength(lbs) 500 550 600 650 1000 1500 Torgue strength (ft lbs) 6 8 10 10 20 40 Voltage withstand(kv) 6 8 10 12 15 25 Screw(mm) 6 8 8 8 8 10 Weight(g) 28 44 50 56 83 233